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Nematode Caenorhabditis Remanei Natural Variation for Lifespan and Stress Response in the Nematode Caenorhabditis remanei Rose M. Reynolds¤, Patrick C. Phillips* Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon, United States of America Abstract Genetic approaches (e.g. mutation, RNA interference) in model organisms, particularly the nematode Caenorhabditis elegans, have yielded a wealth of information on cellular processes that can influence lifespan. Although longevity mutants discovered in the lab are instructive of cellular physiology, lab studies might miss important genes that influence health and longevity in the wild. C. elegans has relatively low natural genetic variation and high levels of linkage disequilibrium, and thus is not optimal for studying natural variation in longevity. In contrast, its close relative C. remanei possesses very high levels of molecular genetic variation and low levels of linkage disequilibrium. To determine whether C. remanei may be a good model system for the study of natural genetic variation in aging, we evaluated levels of quantitative genetic variation for longevity and resistance to oxidative, heat and UV stress. Heritability (and the coefficient of additive genetic variation) was high for oxidative and heat stress resistance, low (but significant) for longevity, and essentially zero for UV stress response. Our results suggest that C. remanei may be a powerful system for studying natural genetic variation for longevity and oxidative and heat stress response, as well as an informative model for the study of functional relationships between longevity and stress response. Citation: Reynolds RM, Phillips PC (2013) Natural Variation for Lifespan and Stress Response in the Nematode Caenorhabditis remanei. PLoS ONE 8(4): e58212. doi:10.1371/journal.pone.0058212 Editor: Matt Kaeberlein, University of Washington, United States of America Received September 3, 2012; Accepted February 1, 2013; Published April 26, 2013 Copyright: ß 2013 Reynolds, Phillips. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This work received funding support from the National Institutes of Health (R03-AG029377 and P01-AG022500 to PCP; Ruth L. Kirschstein National Research Service Award (NRSA) Postdoctoral Fellowship AG032900 to RMR), and the Ellison Medical Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] ¤ Current address: Department of Biology, William Jewell College, Liberty, Missouri, United States of America Introduction selection experiments. One notable advantage of C. elegans over D. melanogaster is that it can be frozen, allowing parental and Current understanding of the genetic basis of the aging process descendant generations to be tested at the same time and allowing has been formed mainly by mutagenesis and RNA interference large numbers of lines to be maintained at minimal effort. Despite studies in the model systems Saccharomyces cerevisiae (yeast), these advantages, the C. elegans model is not optimal for studies of Caenorhabditis elegans (soil-dwelling roundworm), and Drosophila natural genetic variation. Recently several studies have shown that melanogaster (common fruit fly) [1]. Most loci identified as affecting C. elegans populations possess low levels of molecular genetic lifespan in those species are members of evolutionarily conserved variation on a worldwide scale [9–11]. Worse, nearly all of the metabolic pathways such as the insulin/insulin-like signaling [2], existing variation is locked within genome-wide linkage disequi- target-of-rapamycin [3], Jun kinase [4] and sirtuin [5] pathways. librium, yielding a small number of effective haplotypes [11–13]. ‘‘Age mutants’’ can be defined as those displaying extreme Few studies have estimated heritability of lifespan in C. elegans, but longevity, falling well above the maximum lifespan observed under published estimates are not significantly different from zero [14]. normal laboratory conditions. Although natural populations do These issues suggest that C. elegans will serve as a poor model for not display the extreme longevity achieved by Age mutants, studying variation in aging within natural populations [15]. quantitative genetic research has revealed that there is significant In contrast, a close relative of C. elegans, C. remanei, may be an and heritable variation in lifespan within genetically heteroge- ideal system in which to study natural genetic variation. Unlike the neous populations, e.g. h2 = 0.03 [6] to h2 = 0.73 [7]. This implies low genetic variation found within the selfing C. elegans, that studies of the underlying genetics of aging in natural populations of C. remanei harbor significant amounts of molecular populations may suggest promising molecular targets for inter- genetic variation [16,17], and linkage disequilibrium breaks down vention in age-related disease and dysfunction. on the order of 100 base pairs [18]. Unlike the androdioecious C. C. elegans has been a workhorse in the genetics of aging: elegans, C. remanei is composed of males and females, making it a mutagenesis and gene expression studies in C. elegans have better model for human aging. It is a non-parasitic, soil-dwelling facilitated a detailed understanding of many longevity genes and their roles within key metabolic pathways [8]. Its genome has been roundworm that is easily collected in the wild. Significantly, it can sequenced and assembled, it has very short generation times (3–4 be frozen within just a few generations of collection, thereby days), and it can be cultured at extremely large population sizes, maintaining a majority of the natural genetic variation present in facilitating the construction of genetic lines and the conduction of the population when in its natural habitat. Like C. elegans, its PLOS ONE | www.plosone.org 1 April 2013 | Volume 8 | Issue 4 | e58212 Natural Variation for Lifespan in C. remanei genome has been sequenced, it has short generation times (,4 three to five randomly selected L4 females (dams) from the same days), can be cultured at large population sizes, can be genetically stock. Each sire was given 24 hours to sexually mature and mate transformed, and can be frozen, giving us the ability to compare with dams. We then placed each dam on her own small plate and evolved or manipulated genetic lines to the original ancestral allowed her to lay eggs for 24 hours, after which she was population. discarded. Because each dam mated with only one sire, all Given the large amount of molecular genetic variation offspring from a single dam were full sibs; offspring from different previously found in C. remanei for a variety of molecular pathways dams mated to the same male were half-sibs. From each dam, we [17], we predicted that C. remanei might possess the genetic collected eight to 16 full-sib L4 male and female offspring and variation for longevity and stress resistance necessary to make it a placed them on seeded NGM plates in same-sex groups overnight. good model system for the study of natural variation in aging. 20 to 24 hours later those offspring had become young adults and Specifically, we looked for evidence of significant natural genetic were then used in either an oxidative or UV shock assay as variation for longevity and acute heat, oxidative and UV stress described below. For each sire, the offspring from three separate resistance in a genetically heterogeneous population of C. remanei. dams were tested (3 half-sib families). We found high heritability for oxidative and heat stress resistance, Parent-Offspring Design. We randomly collected 120 L4 low but significant heritability for lifespan, and no heritability for females and 360 male L4s (grandparental generation) from the UV stress resistance. These results suggest that C. remanei may be a genetically heterogeneous PX323 stock. Each female was placed good model in which to look for natural genetic variants increasing with three males. These mating groups were given 24 hours to health and lifespan. In particular, it appears promising for sexually mature and mate, after which all adults were discarded. investigations into the complex relationship between stress Female offspring (dams) were collected as L4s within a single six- response and longevity. hour window. Each dam was given three L4 sires (randomly selected from the PX323 stock) with which to mate. 24 hours later Materials and Methods sires were discarded and dams were moved to new plates daily until reproduction had ceased, then once per week until death by Strains & Handling natural causes. Three daughters were collected per female. Each Wild C. remanei were isolated from terrestrial isopods (woodlice) L4 daughter was given three L4 males (randomly selected from the from a single population near Dayton, Ohio and generously PX323 stock) with which to mate. 24 hours later, males were supplied to us by Scott Baird (Wright State University) with the discarded and daughters were moved to new plates daily until permission of the State of Ohio Department of Natural Resources reproduction had ceased, and then once per week until death by (see [19] for details). Isofemale strains were created from mating natural causes. Under
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